Optical amplitude modulation system capable of cancelling high order component

a technology high-order components, applied in the field of optical amplitude modulation systems, can solve the problem that the method of removing the third-order components which is taken by the ssb modulator cannot be applied to the dsb-sc modulator, and achieves the effect of high extinction ratio

Inactive Publication Date: 2009-09-24
NAT INST OF INFORMATION & COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0045]The present invention is able to provide an optical amplitude modulation system which is able to suppress a carrier component (f0) and a high order component (e.g. a second order component (f0±2fm)) and obtain high extinction ratio.

Problems solved by technology

Since the DSB-SC modulator and the optical SSB modulator have different voltage levels applied and different methods of applying the voltage, there is a problem that a method of removing the third order components which is taken by the SSB modulator cannot be applied to the DSB-SC modulator.

Method used

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  • Optical amplitude modulation system capable of cancelling high order component
  • Optical amplitude modulation system capable of cancelling high order component
  • Optical amplitude modulation system capable of cancelling high order component

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Embodiment Construction

[0057]Hereinafter, the present invention is explained referring to figures. FIG. 1 is a schematic block diagram showing an optical amplitude modulation system of the present invention. FIG. 2 is a block diagram showing an optical amplitude modulation system of the present invention. As shown in FIG. 1 and FIG. 2, the optical amplitude modulation system (1) of the present invention relates to an optical amplitude modulation system which comprises: a Mach-Zehnder waveguide (8) including an input part (2) of an optical signal, a branching part (3) where the optical signal is branched, a first arm (4) which is configured to act as a waveguide, wherein one of the optical signal branched from the branching part (3) propagates though the first arm, a second arm (5) which is configured to act as a waveguide, wherein the remaining optical signal branched from the branching part (3) propagates though the second arm, a combining part (6) which combines the optical signals outputted from the fi...

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Abstract

It is an object of the present invention to provide a DSB-SC system capable of suppressing a third order component. The DSB-SC modulation having high extinction ratio can be realized by adjusting the first order component, which is generated by applying a modulation signal (3fm), and the third order component, which is generated by applying a basic signal (fm), to have reversed phase and the same intensity level, and then by applying the first order component to the third order component, these two components cancel each other.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention basically relates to an optical amplitude modulation system. In particular, the present invention is directed to an optical amplitude modulation system which is capable of performing high extinction ratio modulation by suppressing high order components which are generated when DSB modulation is performed.[0003]2. Description of the Related Art[0004]In optical communication, light is modulated to have signal information. As optical modulation, direct modulation and external modulation are known. The direct modulation modulates a driving power of semiconductor laser. And the external modulation modulates light from semiconductor laser by means other than light source. A modulator used in direct modulation is generally called an optical modulator. The optical modulator modulates optical intensity, phase, etc. by causing physical changes in the optical modulator based on signals. As technical problems ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02F1/225G02F1/01G02F1/015G02F1/03G02F1/035H04B10/2507H04B10/516H04B10/54H04B10/61
CPCG02F1/0327G02F2001/212G02F1/2255G02F1/212
Inventor KAWANISHI, TETSUYAIZUTSU, MASAYUKISAKAMOTO, TAKAHIDETSUCHIYA, MASAHIRO
Owner NAT INST OF INFORMATION & COMM TECH
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